Delayed Recovery from Declines in the Population Densities and Species Richness of Intertidal Invertebrates Near Fukushima Daiichi Nuclear Power Plant

Horiguchi, T.; Kodama, Keita; Kume, Gen; Kang, Ik Joon

doi:10.1007/978-981-13-8218-5_6

Cited by 5 publications

(16 citation statements)

References 40 publications

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“…However, why adult rock shells living near the FDNPP disappeared or had little or no reproductive success in 2011 is still unknown 13 . Second, the T. clavigera and T. bronni specimens collected at Okuma in the present study seemed to be offspring of parent shells that had inhabited various sites to the north and south of the FDNPP 14 . The early life stage of T. clavigera and T. bronni , which lasts more than 2 months 21 , is a free-swimming planktonic veliger.…”

Section: Discussionmentioning

confidence: 63%

“…Thus, sessile invertebrate larval recruitment from remote areas to the intertidal zones near the FDNPP was not clearly observed until 2016 at the earliest. These findings suggest that environmental factors inhibited invertebrate reproduction, recruitment, or both in the intertidal zones near the FDNPP 14 .…”

Section: Introductionmentioning

confidence: 84%

“…We observed differences in shell size (i.e., shell height and weight) of T. clavigera specimens among the three sites; in general, specimens collected at Okuma were bigger than those collected at Hiraiso and Tomioka. Because population densities (i.e., abundances) of mussels ( Mytilus galloprovincialis and Septifer virgatus ) and barnacles ( Chthamalus challengeri ), which are prey for T. clavigera , were higher at Okuma than at Tomioka and Hiraiso 14 , the growth rate of the T. clavigera population might have been faster at Okuma than at Tomioka and Hiraiso. However, because the shell height of all of the studied T. clavigera specimens collected at Okuma, Tomioka, and Hiraiso exceeded 12 mm, the minimum shell height of a mature specimen 21 (Supplementary Table S1 ), the reproductive cycle and sexual maturation in the female and male T. clavigera specimens could be compared among the sites.…”

Section: Discussionmentioning

confidence: 99%

“…Despite the large number of studies that have estimated the amount of radionuclide leakage from the FDNPP to the environment and that have examined the behavior and fate of leaked radionuclides in the environment, little is known about the ecological effects of radionuclides generally, and those derived from the nuclear disaster in particular, on wildlife [13][14][15][16] . However, some data on the activity concentrations of radionuclides (i.e., gamma emitters) in aquatic organisms (fishes and shellfishes) have been collected, mainly for regulatory purposes [17][18][19][20] .…”

Section: Consecutive Sexual Maturation Observed In a Rock Shell Populmentioning

confidence: 99%

“…According to the results of quantitative quadrat surveys of sessile invertebrates conducted from 2014 to 2019 at seven intertidal sites in Ibaraki, Fukushima, and Miyagi prefectures, including sites near the FDNPP, species richness and population densities in intertidal zones near the FDNPP did not start to increase again until at least 4–5 years after the 2011 disaster 14 . In April, July, August, and September from 2012 to 2017, we also monitored the population density and spawning behavior of rock shells at sites near the FDNPP.…”

Section: Introductionmentioning

confidence: 99%

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Consecutive sexual maturation observed in a rock shell population in the vicinity of the Fukushima Daiichi Nuclear Power Plant, Japan

Horiguchi

Kawamura

Ohta

2021

Sci Rep

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In 2012, after the accident at the Fukushima Daiichi Nuclear Power Plant (FDNPP) that followed the Tohoku earthquake and tsunami in March 2011, no rock shell (Thais clavigera; currently recognized as Reishia clavigera; Gastropoda, Neogastropoda, Muricidae) specimens were found near the plant from Hirono to Futaba Beach (a distance of approximately 30 km). In July 2016, however, rock shells were again found to inhabit the area. From April 2017 to May 2019, we collected rock shell specimens monthly at two sites near the FDNPP (Okuma and Tomioka) and at a reference site ~ 120 km south of the FDNPP (Hiraiso). We examined the gonads of the specimens histologically to evaluate their reproductive cycle and sexual maturation. The gonads of the rock shells collected at Okuma, ~ 1 km south of the FDNPP, exhibited consecutive sexual maturation during the 2 years from April 2017 to May 2019, whereas sexual maturation of the gonads of specimens collected at Hiraiso was observed only in summer. The consecutive sexual maturation of the gonads of the specimens collected at Okuma might not represent a temporary phenomenon but rather a site-specific phenotype, possibly caused by specific environmental factors near the FDNPP.

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Section: Discussionmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 99%

Section: Consecutive Sexual Maturation Observed In a Rock Shell Populmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Consecutive sexual maturation observed in a rock shell population in the vicinity of the Fukushima Daiichi Nuclear Power Plant, Japan

Horiguchi

Kawamura

Ohta

2021

Sci Rep

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Perceptions of Residents in Relation to Smartphone Applications to Promote Understanding of Radiation Exposure after the Fukushima Accident: A Cross-Sectional Study within and outside Fukushima Prefecture

et al. 2022

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Background: We conducted a cross-sectional study of residents within and outside Fukushima Prefecture to clarify their perceptions of the need for smartphone applications (apps) for explaining exposure doses. The results will lead to more effective methods for identifying target groups for future app development by researchers and municipalities, which will promote residents’ understanding of radiological situations.Materials and Methods: In November 2019, 400 people in Fukushima Prefecture and 400 people outside were surveyed via a web-based questionnaire. In addition to basic characteristics, survey items included concerns about radiation levels and intention to use a smartphone app to keep track of exposure. The analysis was conducted by stratifying responses in each region and then cross-tabulating responses to concerns about radiation levels and intention to use an app by demographic variables. The intention to use an app was analyzed by binomial logistic regression analysis. Text-mining analyses were conducted in KH Coder software.Results and Discussion: Outside Fukushima Prefecture, concerns about the medical exposure of women to radiation exceeded 30%. Within the prefecture, the medical exposure of women, purchasing food products, and consumption of own-grown food were the main concerns. Within the prefecture, having children under the age of 18, the experience of measurement, and having experience of evacuation were significantly related to the intention to use an app.Conclusion: Regional and individual differences were evident. Since respondents differ, it is necessary to develop and promote app use in accordance with their needs and with phases of reconstruction. We expect that a suitable app will not only collect data but also connect local service providers and residents, while protecting personal information.

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Concomitant downregulation of neuropeptide genes in a marine snail with consecutive sexual maturation after a nuclear disaster in Japan

Morishita

Horiguchi²,

Akuta³

et al. 2023

Front. Endocrinol.

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Consecutive sexual maturation (CSM), an abnormal reproductive phenomenon of a marine snail, Reishia clavigera, has occurred since 2017 in the vicinity of the Fukushima Daiichi Nuclear Power Plant after the nuclear disaster there. We hypothesized that alterations in animal physiology mediated through genetic/epigenetic changes could sensitively reflect environmental pollution. Understanding the mechanism of this rapid biological response should enable us to quantitatively evaluate long-lasting effects of the nuclear disaster. To determine the molecular basis for CSM, we conducted transcriptome profiling in the ganglia of normal and CSM snails. We assembled the short-read cDNA sequences obtained by Illumina sequencing, and succeeded in characterizing more than 60,000 gene models that include 88 kinds of neuropeptide precursors by BLAST search and experimental curation. GO-enrichment analysis of the differentially expressed genes demonstrated that severe downregulation of neuropeptide-related genes occurred concomitantly with CSM. In particular, significant decreases of the transcripts of 37 genes among 88 neuropeptide precursor genes, including those for myomodulin, PentaFVamide, maturation-associated peptide-5A and conopressin, were commonly observed in female and male CSM snails. By contrast, microseminoprotein precursor was the only exceptional case where the expression was increased in CSM snails. These results indicate that down-regulation of neuropeptide precursors is a remarkable feature of CSM. We also found that factors involved in epigenetic modification rather than transcription factors showed altered patterns of expression upon CSM. Comprehensive expression panels of snail neuropeptide precursors made in this study will be useful tools for environmental assessment as well as for studying marine reproductive biology.

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Delayed Recovery from Declines in the Population Densities and Species Richness of Intertidal Invertebrates Near Fukushima Daiichi Nuclear Power Plant

Cited by 5 publications

References 40 publications

Consecutive sexual maturation observed in a rock shell population in the vicinity of the Fukushima Daiichi Nuclear Power Plant, Japan

Consecutive sexual maturation observed in a rock shell population in the vicinity of the Fukushima Daiichi Nuclear Power Plant, Japan

Perceptions of Residents in Relation to Smartphone Applications to Promote Understanding of Radiation Exposure after the Fukushima Accident: A Cross-Sectional Study within and outside Fukushima Prefecture

Concomitant downregulation of neuropeptide genes in a marine snail with consecutive sexual maturation after a nuclear disaster in Japan

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